Archived posting to the Leica Users Group, 2006/06/11

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Subject: [Leica] Just back from India, question about burning hole in shutter
From: ricc at mindspring.com (Ric Carter)
Date: Sun Jun 11 06:56:38 2006
References: <000c01c68d41$73a9b410$c310822f@corp.nortel.com> <448C12F3.2000908@waltjohnson.com> <FBE07261-CFAE-460D-BF66-EA7B37E98013@pandora.be>

Because f2 lets in 32 times more light than f16!

Ric Carter
http://gallery.leica-users.org/Passing-Fancies

On Jun 11, 2006, at 9:18 AM, Philippe Orlent wrote:

> Damn Walt, you got me thinking and testing.
> Took a Summarit and burned within 1 sec a hole in a newspaper page  
> at f 1.5.
> The distance was about the one to focal plane.
> Did it again at f 16. A smaller circle on the newspapern but no  
> burning even at 10 secs.
> I also think I know why. Do you?
> ;-)
>
>
> Op 11-jun-06, om 14:56 heeft Walt Johnson het volgende geschreven:
>
>> Vick
>>
>> Simply take the lens off and outside to find the solution to your  
>> question. Focus the sun on your arm  stopped down and wide open  
>> and prove to yourself which is more likely to burn the shutter  
>> curtain.
>>
>> Walt
>>
>> Vick Ko wrote:
>>
>>> I am just back from a very interesting trip to Bangalore (too few  
>>> days, but
>>> in a way, just enough days).  Interesting to see the thread on the
>>> temples...hmm.
>>>
>>> I was visiting my workteam, and a bit of sightseeing.  The camera  
>>> on my trip
>>> was a Leica CL.
>>>
>>> One question, on one day, my workteam took me out to  play  
>>> cricket and when
>>> it was "team photo" time, one of the guys took our cameras (there  
>>> were 2 of
>>> us), stood back and took our photos.  My camera was at f16, and I  
>>> noticed
>>> that he put it face up on the ground.
>>> I had thoughts of horror as I worried about the sun burning a  
>>> hole into the
>>> shutter.  I did notice that he wound the film on, so I think at  
>>> least there
>>> was a chance of the sun, coming in at f16, hitting the meter.
>>>
>>> So my LUG questions:
>>>
>>> 1. can the sun at f16 burn a hole?  I'm not wanting to try the  
>>> experiment
>>>
>>> 2.  can the sun at f16 hurt my CL meter?  It seems fine.  I  
>>> suspect the sun
>>> is not at its focal point for the meter face
>>>
>>> I did notice a discoloured patch that is off to the edge of the  
>>> shutter, 1/4
>>> of the way to the edge.  It doesn't look like the sun "melted"  
>>> the rubber
>>> there, maybe it was there always.
>>>
>>> Thanks in advance.
>>>
>>> Regards,
>>>
>>> Vick Ko
>>>
>>> -------------------------------------------------------------------- 
>>> ----
>>>
>>>
>>> _______________________________________________
>>> Leica Users Group.
>>> See http://leica-users.org/mailman/listinfo/lug for more information
>>>
>>
>> _______________________________________________
>> Leica Users Group.
>> See http://leica-users.org/mailman/listinfo/lug for more information
>>
>
>
> _______________________________________________
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Replies: Reply from clzeni at mindspring.com (Craig Zeni) ([Leica] Just back from India, question about burning hole in shutter)
In reply to: Message from vick.ko at sympatico.ca (Vick Ko) ([Leica] Just back from India, question about burning hole in shutter)
Message from walt at waltjohnson.com (Walt Johnson) ([Leica] Just back from India, question about burning hole in shutter)
Message from philippe.orlent at pandora.be (Philippe Orlent) ([Leica] Just back from India, question about burning hole in shutter)